#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    vector<string> s(n), t(n);
    for (auto &e : s) cin >> e;
    for (auto &e : t) cin >> e;
    
    for (int i = 0; i < n; i++) if (s[i] != t[i]) {
        cout << i + 1 << '\n';
        cout << s[i] << '\n';
        cout << t[i] << '\n';
    }
    
    return 0;
}